Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property and Equipment
Total property and equipment, at cost	$ 132,475	$ 115,579
Less accumulated depreciation	(76,095)	(67,202)
Total property and equipment, net	56,380	48,377
Depreciation expense inclusive of amortization of assets recorded under finance leases	24,700	23,000	$ 18,300
Equipment
Property and Equipment
Total property and equipment, at cost	$ 87,431	76,088
Equipment \| Minimum
Property and Equipment
Estimated Useful Life (Years)	3 years
Equipment \| Maximum
Property and Equipment
Estimated Useful Life (Years)	5 years
Computers And Purchased Software
Property and Equipment
Total property and equipment, at cost	$ 18,756	16,800
Computers And Purchased Software \| Minimum
Property and Equipment
Estimated Useful Life (Years)	3 years
Computers And Purchased Software \| Maximum
Property and Equipment
Estimated Useful Life (Years)	5 years
Tools, Dies and Molds
Property and Equipment
Total property and equipment, at cost	$ 6,492	6,441
Tools, Dies and Molds \| Minimum
Property and Equipment
Estimated Useful Life (Years)	3 years
Tools, Dies and Molds \| Maximum
Property and Equipment
Estimated Useful Life (Years)	5 years
Furniture and Fixtures
Property and Equipment
Total property and equipment, at cost	$ 4,582	3,805
Furniture and Fixtures \| Minimum
Property and Equipment
Estimated Useful Life (Years)	5 years
Furniture and Fixtures \| Maximum
Property and Equipment
Estimated Useful Life (Years)	7 years
Leasehold Improvements
Property and Equipment
Total property and equipment, at cost	$ 7,714	5,877
Capital Leases
Property and Equipment
Total property and equipment, at cost	7,500	6,568
Corporate and Other
Property and Equipment
Fixed asset impairment charges	$ 0	$ 0
Corporate and Other \| Computers And Purchased Software
Property and Equipment
Fixed asset impairment charges			$ 1,100